Scott,
Thanks. The lower belt box fell off before I took the picture. It is Velcro, so it's easy to adjust.
I have a strap between the forearm and bicep. The top of the forearm is near my elbow, so the bicep has to come down (the forearm can't go up). I have 2 snaps on the strap, so I can shorten that distance with the move.
They are pop rivets. I had limited tools and building skills, and basic approval is enough for me.